Pre-0.1 cleanup: fmt, docs, licenses, AUR-ready packaging

- cargo fmt across the workspace (the CI gate the last push tripped).
- varde-daemon: drop the now-unused bytes dependency.
- varde-ctl(1): document push; gc reflects the continuous-sweep
  reality; subscribe mentions push events.
- config.toml example: gc_interval_secs, and an honest note that
  max_download_bytes_per_sec is currently unenforced.
- LICENSE-MIT + LICENSE-APACHE at the root (the declared license now
  ships as files), bundled into release tarballs and installed by the
  PKGBUILD.
- PKGBUILD: real maintainer, AUR pre-flight note (updpkgsums), license
  installation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dist/PKGBUILD

@@ -1,7 +1,8 @@
-# Maintainer: you
+# Maintainer: Bendik Lynghaug <bendik.lynghaug@gmail.com>
 #
-# UNTESTED SKELETON — best-effort Arch packaging for varde. Review before
-# building; in particular pkgver/source must point at a real release.
+# Before pushing to AUR: bump pkgver to the released tag and replace
+# sha256sums with the real digest of the release tarball
+# (`updpkgsums` does both checks in one step).
 
 pkgname=varde
 pkgver=0.1.0
@@ -46,4 +47,7 @@ package() {
 
   install -Dm644 varde.8 "$pkgdir/usr/share/man/man8/varde.8"
   install -Dm644 varde-ctl.1 "$pkgdir/usr/share/man/man1/varde-ctl.1"
+
+  install -Dm644 LICENSE-MIT "$pkgdir/usr/share/licenses/$pkgname/LICENSE-MIT"
+  install -Dm644 LICENSE-APACHE "$pkgdir/usr/share/licenses/$pkgname/LICENSE-APACHE"
 }